Malicious PDF — malware analysis report

Static analysis result for SHA-256 efecb54d1e8a6dfb…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 05:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a31c53405bf80297559f15b8d8cafee0 SHA-1: c4dda5e256cc97ce0ed352f8ef6ca8159d5cd0d6 SHA-256: efecb54d1e8a6dfb0d177ec00935d2f581f94ef908a126172a67487fb5cd5eb0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a browser extension installation lure, a common social-engineering tactic. The document also contains numerous links, many pointing to compromised WordPress sites, suggesting it may be part of a link farm or redirect chain designed to lead the user to malicious content. No scripts were extracted, but the presence of external links and the lure suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fq4fa2lhlvdk1q9esnhkimjqn4/xuneviladugofuzixiga.pdf In PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/xujodanen.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a053c24bcd9---vigavapa.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f9180a76bee---fukexexemibanamuw.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/84899609309.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160725192bb86c---liwawitekadil.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/38903618118.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/48147099796.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/fesami.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b659998a81e---79402989936.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/bezuzafiwogegeguded.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3350c10687---baguni.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/16992422482.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/98519071656.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/zixagopesolodokimifi.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/82482605020.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/20641830180.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/87080038198.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/m4dpvch5h6eo1fl9caleunsin2/kisofuzumavavafasuta.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/37721908033.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/34627956817.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06ccf97b05---61147562848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mp3+song+sitesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 10284 bytes
SHA-256: 48afb782409e82dca862b0e04cdaaa4d25b2388efdfc4183938fa90ee29c1bb9
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 18392 bytes
SHA-256: 5644aada3549699813c2eee56678e6c7019a6f6d955b7011605d41a25448d4cf
font_02_sfnt_off00012372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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